Knob



FIG. 1 is a front and left side perspective view of an embodiment of a knob showing our new design;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof, the bottom of the knob is depicted in broken lines is included for environmental purposes only, and forms no part of the claimed design; and,

FIG. 8 is a perspective view thereof showing the knob in use condition mounted on an electronic audio mixer, the plurality of knobs shown in broken line form no part of the claimed design, the audio mixer depicted in broken lines is shown for environmental purposes only and forms no part of the claimed design. 

CLAIM The ornamental design for a knob, as shown and described. 